Electrical condenser



May 21, 1935. B. HANSSON 2,001,873

ELECTRICAL CONDENSER Filed Nov. 19, 1932 2 Sheets-Sheet. l

In ven Zor- BRO}? HAM/$5 1935- B. HANSSON I 2,001,873

' ELECTRICAL commnsna Filed Nov. 19, 1932 2 Sheets-Sheet 2 vent'or Patented May 21, 1935 2,001,873

UNITED STATES PATENT OFFICE.

ELECTRICAL connansaa Bror Hansson, Stockholm, Sweden, assignor to Allmanna Svenska Elektriska Aktiebolaget, Vasteras, Sweden, a corporation of Sweden.

Application November 19; 1932, Serial No. 643,456

In Sweden November 19, 1931 4 Claims. (01. 175-41) The present invention has for its object an ima cylindrical bundle. 4 is a container preferably proved type or electrical condensers, .especially of sheet steel closed by an elastic wall 5. In the for high voltages. According to the invention elastic wall insulating bushings 6 are fastened the condenser elements are enclosed in an herand the conducting foils of the condenser ele 7 meticallyclosed elastic vessel entirely filled with ments (are interconnected and connected to 6 a suitable insulating fluid. This fluid will thereterminals arranged in the insulating bushings by tore not be exposed to the influence oi the oxygen means of conductors I. In the interior of the of the air and will therefore not be oxidized. container or vessel 4, a cooling coil is arranged In earlier types of electrical apparatus inconsisting of helically wound pipes passed by a I 10 sulated by a dielectric fluid, the containers have cooling medium, for instance water. The con.- 10 been provided with a special expansion device in tainer l is provided with a second cover 9 flanged the form of an open expansion vessel connected to the container and fastened by means of bolts to the container by means of a pipeline. Other and nuts Ill. The joint between the container 4 devices are also known consisting in a closed and cover 9 may be tightened in the usual manl5 elastic vessel communicating with the container, ner by a suitable packing. 16 this vessel usually being provided with corrugated The space enclosed by the container 4 and walls. In the .flrst case the vessel must have a cover 9 is thus divided into two compartments a volume equal to the maximum expansion of the by the wall 5. One of these compartments encontent of the main container. As the expansion closes the condenser. elements and is entirely 20 vessel in this case is open, the surface ot the oil fllled with a suitable insulating fluid for instance 20 or fluid will be exposed to the influence of the-air, a light oil with great dielectric strength. The but this surface will be considerably smaller than other compartment is filled with a rather heavy it the fluid in the container itself wouldbeexposed oil or compound and connected to a pressure to the air. In the second case, the expansion chamber or vessel ll by means of a pipeline I3.

vessel must be able to take care or the whole The pipeline i3 is joined to the cover 9 by means 25 change in volume of the content inthe container. of flanges l5 pressed together with bolts and As the flexibility of a metallic vessel is rather nuts l6. limited, the volume of the expansion vessel there- By means of a pump I'I driven by a motor IS a i'ore must be of nearly the same size as the main pressure is exerted onthe oil in the pressure container. T, equalizing vessel I. The pump I1 is connected 30 According to the present invention, the main with theyessel by means oiapipe l9. Inorder container itself is made flexible enough to take to get a limitation of the pressure, the pump is care of the expansion 01' the content in the conshunted with a. pipeline 2|, 22. In this pipeline tainer and thus a special expansion device ca an oil container 20 and an automatically pressure be omitted. valve 23 are inserted. 5

According to a modification of the invention In the modification shown at Fig. 2 each eonone or a plurality of elastic vessels containing denser element is enclosed in a flat cylindrical condenser elements and an insulating fluid are elastic vessel 24, which preferably may have e pos d t a p essure in a spec al p essu vessel. corrugated side walls. In this modification the This pressure is transmitted through the yieldpressure is achieved by a compressed gas, de-

able Walls Of the elastic Vessels. and as he preslivered from a container 25. As each condenser sure of the fluid in the elastic vessels then will el t in thi modification is enclosed in a be the same as in the pressure vessel, the dielecl d, v ssel, the elastic wall 5 can be omitted. tric strength of the insulating fluid will be raise Th pressure in both modifications can either according to the pressure exerted on it. 1 b t itt d to the elastic vessels by means of Qln the mp yin win s w ifl aa heavy oil or compound or can the space outside tions 01 the invention are ShOWnthe elastic vessels be entirely filled with a suitable l is an elevation partly in section showing gas, for in tance nitrogen or hydrogen. one tom of the invention, and Fig. 2 is a similar In b th modifications the leading through bush- 59 Vi w h w a modification ings are placed in thecover 9, but in some cases f In Fi 1 8 battery f wndensers according to they may be placed in the walls of the container 4. the invention is shown. I is the condenser ele- 1 l i as my lnventionzments 6011 1 118 0! du t s o s 2 Of 8 Suit- 1. An electrical condenser consisting of con able me al parated by insulating films 3- Th ducting foils separated by dielectric fllms, a

foils and films are prefera ly w un helically to hermetically closed elastic vessel containing said u elements, an insulating fluid entirely filling said vessel, a pressure chamber adjacent to said elastic vessel and filled with a medium under pressure, the elastic vessel being exposed to the pressure of said medium, tight leading through insulators arranged in the walls of said vessel, and conductors connecting said foils to terminals arranged in said insulators.

2. An electrical condenser consisting of conducting ioils separated by dielectric films, a hermetically closed elastic vessel containing said elements, an insulating fluid entirely filling said vessel, 9. pressure chamber adjacent to said elastic vessel flied with a pressure transmitting medium, tight leading through insulators arranged in the walls of said vessel, conductors connecting said foils to terminals arranged in said insulators and a pressure generator exerting a pressure on the pressure transmitting medium in said pressure chamber.

3. An electrical condenser consisting of ele ments of conducting foils separated by dielectric films, a hermetically closed elastic vessel containing said elements, an insulating fluid entirely filling said vessel, a pressure chamber adjacent to said elastic vessel filled with a pressure transmitting medium, a pump connected to said pressure chamber exerting a pressure on the pressure transmitting medium, a pressure limiting valve, tight leading through insulators arranged in the walls of said vessel, conductors connecting said foils to terminals arranged in said insulators.

4. An electrical condenser comprising a plurality of hermetically closed elastic vessels, containing condenser elements consisting 01 conducting foils, separated by dielectric films, said elastic vessels being entirely filled with an insulating fluid, a pressure chamber adjacent to said vessels and filled with a pressure transmiting medium, leading through insulators arranged in the walls of said elastic vessels, conductors connecting the conducting foils of the condenser elements with terminals arranged in said insulators, a pressure generating device exerting a pressure on the pressure transmitting medium contained in said pressure chamber and a pressure limiting device consisting of an automatical valve inserted in a by pass connection to said pressure generating device.

BROR HANSSON. 

